Try-square and bevel



(No Model.)

G. F. MERRIPIELD.

TRY SQUARE AND BEVBL.

No. 399,424. Patented Mar. l2, 1889.

miran Sterns armar Orricn.

CHARLES F. MERRIFIELD, OF llRNARDSTOlYN, MASSACHUSETTS.

TRY-SQUARE AND IBEVEL.

SPECIFICATION forming part of Letters Patent No. 399,424, dated March 12, 1889.

Application filed November 6, 1888. Serial No. 290,133. (No model.)

To all whom t may concern:

3e it known that I, CHARLES F. MERRI- FIELD, a citizen of the United States, residing at lernardstown, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Try- Square and Bevel Instruments; and I do hereby declare the followin g to be a full, clear, and exact description of the invent-ion, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in try and 'l' squares, and combines the funetions, also, of a bevel and miter tool orinstrument for joiners use.

In my drawings illustratingl my invention, Figure l is a plan or top view ot' my device. Fig. 2 a bottom view showing its adjustment as a T-square. Fig. 3 is a section on line :1; a' of Fig. l. Figs. -LL and 5 are details, more fully illustrating my invention.

Similar reference-letters indicate like parts in all of the figures.

Referring to the drawings, Ais the stock of the square, recessed, preferably7 011 its upper and lower faces, the bottoms of said recesses being roughen ed to prevent the square from slipping when the stock bears upon a sha-rply-rounded or an gular surface. An open slot, d, is formed in the squares stock to inclose the blade of the square, and one end of said stock is rounded in semicircular form and pierced with an eye to receive a screw-bolt, C.

B is a disk milled on its edge and provided with a central opening for the bolt C, and four holes, l) c (l e, placed in radial lines from the center of said disk at right angles to each other. At the rou'nd end of the head A are oppositie holes, f g, which correspond to the holes c e of the disk.

D is the blade of the square, provided with a long slot, 71 and conical indentations 'i r Z m n.

The disk B has fixed in its central hole a bolt C, and in its small holes long screws, each of the latter being provided with conical ends.

In placing the several parts of the implement together the blade is slipped. into the open slot of the stock until the slot 7L comes opposite the eye of the bolt. The bolt C is now thrust into the said eye through the upper portion of the stock, through the slot of the blade, and thence through the lower portion of said stock, the screws 1' s entering at the same time opposite holes, f g, of the same. The nut F, provided for the purpose, may now be run on the end of .the bolt to clamp the blade to position with reference to the stock to form an ordinary try-square or a T-square, or to make any required angle within a range of about three hundred degrees. IVhen it is required to adj ust the blade of the square to an angle of ninety degrees to form a try-square, the said blade is drawn out to the limit of the slot and revolved about its axis until the long screws i' s, which enter the holes f g of the stock, are coincident with indentations -L' j of 'the blade, when the nut F is clamped hard to draw the conical ends of said long screws into the said indentations. Then it is required to form a miter of forty-five degrees, the blade is shifted until the indentations 7a Z or m n of the blade are coincident with the screws Ai' s, when the nut is againV driven to place to firmly clamp the stock to the blade.

\Vhen any other than a right angle or an angle of forty-Ii ve degrees is required, the blade, which may be provided with other indent-ations properly placed, is shifted in the manner described and clamped; or the ends of the long screws, together with the ends of the stock, may serve the purpose of a temporary hold'. A hold less positive than when indentations in the blade are provided may be formed when the two parts of the head are clamped together until the points of the long screws of the disk impinge upon the surface of the blade; but such a hold would be much less reliable, as a matter of course, than where the indentations are used.

In order to provide a perfectbearing of the stock upon a piece of material of rounding or angular surface, I have provided lugs K, formed upon either or both outer surfaces of said stock, which, whenthe square is in practical service, will. find bearing places under almost any conditions.

To form a T-squa-re of the implement, it only necessary to draw the blade from its stock, fix it at an angle of ninety degrees, and adjust it before clamping, so that a portion IOO will be on either side of the stock. Bv drawing the bla-de in a straight line from its stock and clzunping' it a very convenient straightedge Will be formed.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

I. The combination, with the stock of the square, having an open slot for the blade, radially-opposite holes, and an axis-hole, the disk, the axis-bolt, and screws, as described, of the blade provided with it long,` slot and conical indentations and the clmnping-nutfor the bolt, as and for the purpose specified.

2. In a try-square and bevel7 the slotted I5 stock provided with bolt-openings, in combination with zt disk pro vided With fixed screws and a, bolt and the indented blade provided with a slot, as and for the purpose set forth.

In testimony whereof I afix 1n y signature in 2o JAMES S. GRINNELL, WVM. II. ALLEN. *i 

